ANT0104 Ultra Wideband Omnidirectional Anteeno

Cabbiraadda wax ku oolka ah ee isku-dhafka tooska ah ee anteenada D, waxaan ka qeexeynaa cabbirka kala duwan ee shucaaca anteenada.

Toosinta D waa saamiga cufnaanta awoodda ugu badan ee la radiated P(θ,φ) ugu badnaan qiimaha celceliska P(θ,φ)av ee ku yaal goob ku taal gobolka fog-feer, waana saamiga aan cabbir lahayn oo ka weyn ama la mid ah 1. Qaaciddada xisaabinta waa sidan soo socota:

Intaa waxaa dheer, toosinta D waxaa lagu xisaabin karaa qaacidada soo socota:

D = 4 PI / Ω _A

Ficil ahaan, xisaabinta logarithmic ee D waxaa badanaa loo isticmaalaa in lagu matalo faa'iidada jihada ee anteenada:

D = 10 log⁡ d

Tilmaamaha D ee kor ku xusan waxaa loo fasiri karaa saamiga baaxadda wareegga (4π rad²) ee farqiga iftiinka anteenada ω _A. Tusaale ahaan, haddii anteenadu ay ku faafto oo keliya booska sare ee hemispherical oo baaxaddiisuna ay tahay ω _A=2π rad², markaa toosinteedu waa:

Haddii la qaato logarithm-ka labada dhinac ee isle'egta kor ku xusan, faa'iidada jihada ee anteenada marka loo eego isotropy ayaa la heli karaa. Waa in la ogaadaa in faa'iidadani ay ka tarjumayso oo keliya shucaaca qaabka jihada ee anteenada, cutubka dBi, maadaama hufnaanta gudbinta aan loo tixgelin inay tahay faa'iidada ugu habboon. Natiijooyinka xisaabinta waa sida soo socota:

3.01 fasalka: : dBi d = 10 log⁡ 2 walxo

Cutubyada faa'iidada anteenada waa dBi iyo dBd, halkaasoo:

DBi: waa faa'iidada laga helo shucaaca anteenada marka loo eego isha dhibicda, sababtoo ah isha dhibicda waxay leedahay ω _A=4π faa'iidada jihadana waa 0dB;

DBd: waa faa'iidada shucaaca anteenada marka loo eego anteenada dipole-ka nus-hir;

Qaacidada beddelka u dhexeeya dBi iyo dBd waa:

2.15 fasalka: : dBi 0 DBD agab